Backstage: Improper authorization enforcement for TechDocs static content
Impact
An authenticated user with access to one TechDocs documentation site could craft a URL able to read documentation belonging to a different entity. This only affects deployments using the external TechDocs builder with an external storage provider (S3, GCS, etc.) and the permission framework enabled. Instances that do not use the permission framework are unaffected, since TechDocs content is visible to all authenticated users by design.
Patches
Patched in @backstage/plugin-techdocs-backend version 2.2.4
Workarounds
- None other than upgrading. Deployments that serve TechDocs from local storage are not affected.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | @backstage/plugin-techdocs-backend | < 2.2.4 | 2.2.4 |
References
- https://github.com/backstage/backstage/security/advisories/GHSA-rg9r-hr7g-5gc2
- https://nvd.nist.gov/vuln/detail/CVE-2026-106489
- https://github.com/backstage/backstage/commit/bf6bbf7326ada7d96d7b2c4ebc4a71546106f311
- https://github.com/backstage/backstage
- https://github.com/backstage/backstage/releases/tag/v1.54.6
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N- Weakness (CWE)
CWE-22, CWE-862- Platform
- npm
- Package
@backstage/plugin-techdocs-backend- Disclosed
- 07.10.2026
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-rg9r-hr7g-5gc2 - CC BY 4.0
Vulnerability history: @backstage/plugin-techdocs-backend
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 4
- First → latest
- 09.2024 10.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 1
- Medium 3
Disclosures per year
- 2024: 2
- 2025: 0
- 2026: 2
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